CN107576027B - Opening degree control method, opening degree control device and refrigeration equipment - Google Patents
Opening degree control method, opening degree control device and refrigeration equipmentDownload PDFInfo
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- CN107576027B CN107576027BCN201710697937.2ACN201710697937ACN107576027BCN 107576027 BCN107576027 BCN 107576027BCN 201710697937 ACN201710697937 ACN 201710697937ACN 107576027 BCN107576027 BCN 107576027B
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Abstract
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an opening and closing degree control method, an opening and closing degree control device and refrigeration equipment.
Background
In the related art, when only one indoor unit of the multi-type air conditioner operates in the cooling mode, the expansion valve is communicated between the indoor heat exchanger of the indoor unit and the compressor, and the opening and closing degree of the indoor heat exchanger is usually kept unchanged during the initial operation period, thereby causing the following technical defects:
when the multi-connected air conditioner operates in a severe working condition environment, the exhaust temperature of the multi-connected air conditioner may be too high or too low, that is, too much refrigerant liquid or too low evaporation pressure enters the indoor heat exchanger, and further, the compressor may operate in an overheat manner or the heat degree is not enough to cause liquid compression, and therefore, the service life of the compressor and the reliability of the multi-connected air conditioner may be seriously affected.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an object of the present invention is to provide an opening and closing degree control method.
Another object of the present invention is to provide an opening/closing degree control device.
It is another object of the present invention to provide a refrigeration apparatus.
It is another object of the present invention to provide a computer-readable storage medium.
In order to achieve the above object, a first aspect of the present invention provides an opening/closing degree control method, including: when detecting that a specified number of indoor units operate in a refrigeration mode, judging whether the outlet exhaust temperature of the compressor belongs to a preset outlet exhaust temperature range; when the outlet exhaust temperature of the compressor is judged not to belong to the preset outlet exhaust temperature range, outlet temperature information of the indoor heat exchanger is obtained; and periodically adjusting the opening and closing degree of the expansion valve according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor belongs to a preset outlet exhaust temperature range.
According to the technical scheme, when the specified number of indoor units are detected to operate in the refrigeration mode, whether the outlet exhaust temperature of the compressor belongs to the preset outlet exhaust temperature range is judged, when the outlet exhaust temperature of the compressor is judged not to belong to the preset outlet exhaust temperature range, outlet temperature information of the indoor heat exchanger is obtained, the opening and closing degree of the expansion valve is periodically adjusted according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor belongs to the preset outlet exhaust temperature range, the outlet exhaust temperature of the compressor is effectively controlled, the phenomenon that the compressor is overheated or the overheating degree is insufficient to cause hydraulic compression is reduced, the service life of the compressor is prolonged, and the reliability of the multi-connected air conditioner is improved.
Specifically, the cooling process of the air conditioner generally includes: the low-pressure steam enters the compressor, the compressor discharges high-pressure steam, the high-pressure steam flows into the indoor heat exchanger through the expansion valve, the indoor heat exchanger is equivalent to a condenser at the moment, the high-pressure steam evaporates in the indoor heat exchanger to absorb heat, and a fan of the indoor unit absorbs indoor air to exchange heat with the indoor heat exchanger so as to reduce the indoor temperature.
For example, when the preset outlet exhaust temperature range is 65-95 ℃, namely the preset outlet temperature is judged to be more than 95 ℃ or less than 55 ℃, the outlet temperature information of the indoor heat exchanger is obtained, so as to adjust the opening degree of the expansion valve, namely when the outlet exhaust temperature of the compressor is more than 95 ℃, the opening degree of the expansion valve is increased to reduce the pressure of the discharged high-pressure steam, further reducing the exhaust temperature, and when the outlet exhaust temperature of the compressor is less than 55 ℃, reducing the opening degree of the expansion valve, to increase the pressure of the discharged high-pressure steam and further increase the exhaust temperature, because the expansion valve is controlled by the indoor unit, therefore, the opening degree of the expansion valve is related to the outlet temperature information of the indoor heat exchanger, the corresponding average temperature correction value is determined according to the outlet temperature information, and adjusting the opening degree of the expansion valve according to the corresponding relation between the average temperature correction value and the opening degree.
The preset period for adjusting the opening degree of the expansion valve may be twice/120 seconds.
In the above technical solution, preferably, acquiring outlet temperature information of the indoor heat exchanger specifically includes: when the designated number is 1, detecting the real-time outlet temperature of 1 indoor heat exchanger according to a preset period; and determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period, wherein the preset period comprises at least one detection period, and the outlet temperature information comprises the real-time outlet temperature and the average temperature correction value.
In the technical scheme, when 1 indoor unit operates in a refrigeration mode, in order to overcome technical defects caused by the fixed opening and closing degree of an expansion valve, the real-time outlet temperature of 1 indoor heat exchanger is detected according to a preset period, an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period is determined, and the opening and closing degree of the expansion valve is adjusted at the end of each detection period according to the average temperature correction value.
Any one of the above techniquesIn the technical scheme, preferably, determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period specifically includes: the maximum value of the preset outlet exhaust temperature range is a first exhaust temperature, and when the outlet exhaust temperature of the compressor is detected to be higher than the first exhaust temperature, the average temperature correction value is determined according to a first preset average temperature calculation formula, wherein the first preset average temperature calculation formula comprises the following steps: te (Te)Average＝Tet-T1，TeAverageCharacterization of mean temperature correction value, TetCharacterizing the mean value, T, of the real-time outlet temperature over the detection period1And representing a first preset correction parameter, wherein the first preset correction parameter is larger than zero.
In the technical scheme, the maximum value of the preset outlet exhaust temperature range is a first exhaust temperature, when the outlet exhaust temperature of the compressor is detected to be higher than the first exhaust temperature, the average temperature correction value is determined according to a first preset average temperature calculation formula, and the formula Te is used for determining the average temperature correction valueAverage＝Tet-T1The average temperature correction value when the outlet exhaust temperature of the compressor is higher than the first exhaust temperature is intuitively and accurately calculated, the average value of the real-time outlet temperature in the detection period and the first preset correction parameter are taken into consideration, the accuracy of the average temperature correction value is further improved, the adjustment accuracy of the expansion valve is further improved, and the opening and closing degree of the expansion valve is periodically controlled to be increased when the outlet exhaust temperature is higher than the first exhaust temperature.
It is worth pointing out that, by controlling the outlet exhaust temperature of the compressor not to be too high, the volume rate reduction and the power consumption increase of the compressor can be avoided, and especially the carbon deposit and the acid by-products generated by the refrigerant are reduced, therefore, the type of the refrigerant determines the value of the first exhaust temperature.
In any one of the foregoing technical solutions, preferably, the determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period further includes: presetting the minimum value of the outlet exhaust temperature range as a second exhaust temperature, when detecting that the outlet exhaust temperature of the compressor is less than the second exhaust temperature,determining an average temperature correction value according to a second preset average temperature calculation formula, wherein the second preset average temperature calculation formula comprises: te (Te)Average＝Tet+T2，TeAverageCharacterization of mean temperature correction value, TetCharacterizing the mean value, T, of the real-time outlet temperature over the detection period2And representing a second preset correction parameter, wherein the second preset correction parameter is larger than zero.
In the technical scheme, the minimum value of the preset outlet exhaust temperature range is the second exhaust temperature, when the outlet exhaust temperature of the compressor is detected to be lower than the second exhaust temperature, the average temperature correction value is determined according to a second preset average temperature calculation formula, and the formula Te is usedAverage＝Tet+T2And accurately calculating an average temperature correction value when the outlet exhaust temperature of the compressor is lower than the second exhaust temperature, namely periodically controlling the opening and closing degree of the expansion valve to be reduced when the outlet exhaust temperature is lower than the second exhaust temperature, particularly reducing the moisture vapor sucked by the compressor, and further improving the reliability of the compressor.
In any one of the foregoing technical solutions, preferably, the determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period further includes: and when the designated number is more than or equal to 1, calculating the average value of the real-time outlet temperatures of all the indoor heat exchangers in each detection period, and recording the average value as an average temperature correction value.
In the technical scheme, when the specified number is greater than or equal to 1, in each detection period, an average value of real-time outlet temperatures of all indoor heat exchangers (in an operating state) is calculated and recorded as an average temperature correction value, and similarly, the opening and closing degree of the expansion valve is determined according to the average temperature correction value.
Specifically, the determination process of the average temperature correction value is written as an auxiliary correction, and the specific correction process is as follows:
(1) if the indoor unit discharge temperature is too high, i.e., a (a ═ 95 ℃) is higher than or equal to a, the auxiliary correction is entered, and if B (B ═ 75 ℃) is lower than or equal to B, the auxiliary correction is exited.
(2) The auxiliary correction is entered when the indoor unit discharge air temperature is too low, that is, the discharge air is equal to or less than C (55℃), and exits when the discharge air temperature is equal to or more than D (65℃).
In any one of the above technical solutions, preferably, the periodically adjusting the opening and closing degree of the expansion valve according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor falls within a preset outlet exhaust temperature range specifically includes: determining a preset opening degree corresponding to the average temperature correction value; at the end of each detection period, adjusting the opening degree of the expansion valve to a preset opening degree; and when the outlet exhaust temperature of the compressor is detected to belong to the preset outlet exhaust temperature range, ending the detection period, wherein the average temperature correction value is positively correlated with the preset opening and closing degree.
According to the technical scheme, the opening degree of the expansion valve is adjusted to the preset opening degree by determining the preset opening degree corresponding to the average temperature correction value at the end time of each detection period, and the detection period is ended when the outlet exhaust temperature of the compressor is detected to belong to the preset outlet exhaust temperature range, so that the accuracy of adjusting the opening degree of the expansion valve is improved, the phenomenon of hydraulic compression caused by overheating operation or insufficient overheating of the compressor is reduced, the service life of the compressor is prolonged, and the reliability of the multi-connected air conditioner is improved.
The preset opening degree is set according to different refrigeration equipment, and the average temperature correction value is in positive correlation with the preset opening degree, namely the higher the average temperature correction value is, the larger the preset opening degree is.
In a second aspect of the present invention, there is provided an opening/closing degree control apparatus, including: the judging unit is used for judging whether the outlet exhaust temperature of the compressor belongs to a preset outlet exhaust temperature range or not when detecting that the specified number of indoor units operate in the refrigeration mode; the acquiring unit is used for acquiring outlet temperature information of the indoor heat exchanger when judging that the outlet exhaust temperature of the compressor does not belong to a preset outlet exhaust temperature range; and the adjusting unit is used for periodically adjusting the opening and closing degree of the expansion valve according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor belongs to a preset outlet exhaust temperature range.
According to the technical scheme, when the specified number of indoor units are detected to operate in the refrigeration mode, whether the outlet exhaust temperature of the compressor belongs to the preset outlet exhaust temperature range is judged, when the outlet exhaust temperature of the compressor is judged not to belong to the preset outlet exhaust temperature range, outlet temperature information of the indoor heat exchanger is obtained, the opening and closing degree of the expansion valve is periodically adjusted according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor belongs to the preset outlet exhaust temperature range, the outlet exhaust temperature of the compressor is effectively controlled, the phenomenon that the compressor is overheated or the overheating degree is insufficient to cause hydraulic compression is reduced, the service life of the compressor is prolonged, and the reliability of the multi-connected air conditioner is improved.
Specifically, the cooling process of the air conditioner generally includes: the low-pressure steam enters the compressor, the compressor discharges high-pressure steam, the high-pressure steam flows into the indoor heat exchanger through the expansion valve, the indoor heat exchanger is equivalent to a condenser at the moment, the high-pressure steam evaporates in the indoor heat exchanger to absorb heat, and a fan of the indoor unit absorbs indoor air to exchange heat with the indoor heat exchanger so as to reduce the indoor temperature.
For example, when the preset outlet exhaust temperature range is 65-95 ℃, namely the preset outlet temperature is judged to be more than 95 ℃ or less than 55 ℃, the outlet temperature information of the indoor heat exchanger is obtained, so as to adjust the opening degree of the expansion valve, namely when the outlet exhaust temperature of the compressor is more than 95 ℃, the opening degree of the expansion valve is increased to reduce the pressure of the discharged high-pressure steam, further reducing the exhaust temperature, and when the outlet exhaust temperature of the compressor is less than 55 ℃, reducing the opening degree of the expansion valve, to increase the pressure of the discharged high-pressure steam and further increase the exhaust temperature, because the expansion valve is controlled by the indoor unit, therefore, the opening degree of the expansion valve is related to the outlet temperature information of the indoor heat exchanger, the corresponding average temperature correction value is determined according to the outlet temperature information, and adjusting the opening degree of the expansion valve according to the corresponding relation between the average temperature correction value and the opening degree.
The preset period for adjusting the opening degree of the expansion valve may be twice/120 seconds.
In any one of the above technical solutions, preferably, the opening/closing degree control device further includes: the first detection unit is used for detecting the real-time outlet temperature of 1 indoor heat exchanger according to a preset period when the designated number is 1; the first determining unit is used for determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period, wherein the preset period comprises at least one detection period, and the outlet temperature information comprises the real-time outlet temperature and the average temperature correction value.
In the technical scheme, when 1 indoor unit operates in a refrigeration mode, in order to overcome technical defects caused by the fixed opening and closing degree of an expansion valve, the real-time outlet temperature of 1 indoor heat exchanger is detected according to a preset period, an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period is determined, and the opening and closing degree of the expansion valve is adjusted at the end of each detection period according to the average temperature correction value.
In any one of the above technical solutions, preferably, the opening/closing degree control device further includes: the first calculation unit is used for determining an average temperature correction value according to a first preset average temperature calculation formula when the outlet exhaust temperature of the compressor is detected to be greater than the first exhaust temperature, wherein the first preset average temperature calculation formula comprises the following steps: te (Te)Average＝Tet-T1，TeAverageCharacterization of mean temperature correction value, TetCharacterizing the mean value, T, of the real-time outlet temperature over the detection period1And representing a first preset correction parameter, wherein the first preset correction parameter is larger than zero.
In the technical scheme, when the maximum value of the preset outlet exhaust temperature range is the first exhaust temperature and the outlet exhaust temperature of the compressor is detected to be higher than the first exhaust temperature,determining an average temperature correction value according to a first predetermined average temperature calculation formula, using formula TeAverage＝Tet-T1The average temperature correction value when the outlet exhaust temperature of the compressor is higher than the first exhaust temperature is intuitively and accurately calculated, the average value of the real-time outlet temperature in the detection period and the first preset correction parameter are taken into consideration, the accuracy of the average temperature correction value is further improved, the adjustment accuracy of the expansion valve is further improved, and the opening and closing degree of the expansion valve is periodically controlled to be increased when the outlet exhaust temperature is higher than the first exhaust temperature.
It is worth pointing out that, by controlling the outlet exhaust temperature of the compressor not to be too high, the volume rate reduction and the power consumption increase of the compressor can be avoided, and especially the carbon deposit and the acid by-products generated by the refrigerant are reduced, therefore, the type of the refrigerant determines the value of the first exhaust temperature.
In any one of the above technical solutions, preferably, the opening/closing degree control device further includes: the second calculation unit is used for determining an average temperature correction value according to a second preset average temperature calculation formula when the outlet exhaust temperature of the compressor is detected to be lower than the second exhaust temperature, wherein the second preset average temperature calculation formula comprises: te (Te)Average＝Tet+T2，TeAverageCharacterization of mean temperature correction value, TetCharacterizing the mean value, T, of the real-time outlet temperature over the detection period2And representing a second preset correction parameter, wherein the second preset correction parameter is larger than zero.
In the technical scheme, the minimum value of the preset outlet exhaust temperature range is the second exhaust temperature, when the outlet exhaust temperature of the compressor is detected to be lower than the second exhaust temperature, the average temperature correction value is determined according to a second preset average temperature calculation formula, and the formula Te is usedAverage＝Tet+T2Accurately calculating the average temperature correction value when the outlet exhaust temperature of the compressor is less than the second exhaust temperature, namely periodically controlling the opening and closing degree of the expansion valve to be reduced when the outlet exhaust temperature is less than the second exhaust temperature,in particular, the suction of wet vapor by the compressor is reduced, and the reliability of the compressor is improved.
In any one of the above technical solutions, preferably, the opening/closing degree control device further includes: and the third calculating unit is used for calculating the average value of the real-time outlet temperatures of all the indoor heat exchangers in each detection period and recording the average value as an average temperature correction value when the designated number is more than or equal to 1.
In the technical scheme, when the specified number is greater than or equal to 1, in each detection period, an average value of real-time outlet temperatures of all indoor heat exchangers (in an operating state) is calculated and recorded as an average temperature correction value, and similarly, the opening and closing degree of the expansion valve is determined according to the average temperature correction value.
Specifically, the determination process of the average temperature correction value is written as an auxiliary correction, and the specific correction process is as follows:
(1) if the indoor unit discharge temperature is too high, i.e., a (a ═ 95 ℃) is higher than or equal to a, the auxiliary correction is entered, and if B (B ═ 75 ℃) is lower than or equal to B, the auxiliary correction is exited.
(2) The auxiliary correction is entered when the indoor unit discharge air temperature is too low, that is, the discharge air is equal to or less than C (55℃), and exits when the discharge air temperature is equal to or more than D (65℃).
In any one of the above technical solutions, preferably, the opening/closing degree control device includes: the second determining unit is used for determining the preset opening degree corresponding to the average temperature correction value; the adjusting unit is also used for: at the end of each detection period, adjusting the opening degree of the expansion valve to a preset opening degree; the adjusting unit is also used for: and when the outlet exhaust temperature of the compressor is detected to belong to the preset outlet exhaust temperature range, ending the detection period, wherein the average temperature correction value is positively correlated with the preset opening and closing degree.
According to the technical scheme, the opening degree of the expansion valve is adjusted to the preset opening degree by determining the preset opening degree corresponding to the average temperature correction value at the end time of each detection period, and the detection period is ended when the outlet exhaust temperature of the compressor is detected to belong to the preset outlet exhaust temperature range, so that the accuracy of adjusting the opening degree of the expansion valve is improved, the phenomenon of hydraulic compression caused by overheating operation or insufficient overheating of the compressor is reduced, the service life of the compressor is prolonged, and the reliability of the multi-connected air conditioner is improved.
The preset opening degree is set according to different refrigeration equipment, and the average temperature correction value is in positive correlation with the preset opening degree, namely the higher the average temperature correction value is, the larger the preset opening degree is.
In the third aspect of the present invention, a refrigeration apparatus is further provided, which includes the opening/closing degree control device according to any one of the second aspects of the present invention.
In this embodiment, the refrigeration apparatus includes any opening degree control device according to the second aspect of the present invention, and therefore has all the advantages of any opening degree control device according to the second aspect of the present invention, and details thereof are omitted here.
In the above technical solution, preferably, the refrigeration apparatus is a multi-split air conditioner, a plurality of indoor units of the multi-split air conditioner are connected in parallel to one compressor, and an expansion valve is disposed in a communication pipeline between an indoor heat exchanger of each indoor unit and the compressor.
In an embodiment of the fourth aspect of the present invention, a computer-readable storage medium is further provided, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the opening and closing degree control method according to any one of the above-mentioned embodiments.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic flow diagram of a method of opening and closing degree control according to one embodiment of the present invention;
FIG. 2 shows a schematic block diagram of an opening and closing degree control apparatus according to an embodiment of the present invention;
FIG. 3 illustrates a schematic block diagram of a multi-connected air conditioner according to one embodiment of the present invention
FIG. 4 shows a schematic flow diagram of a method of opening and closing degree control according to another embodiment of the invention;
fig. 5 shows a schematic flow chart of a method of controlling a degree of opening and closing according to another embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1:
fig. 1 shows a schematic flow chart of a method of controlling a degree of opening and closing according to an embodiment of the present invention.
Fig. 1 shows a method for controlling a degree of opening and closing according to an embodiment of the present invention, including: step S102, when detecting that a specified number of indoor units operate in a refrigeration mode, judging whether the outlet exhaust temperature of the compressor belongs to a preset outlet exhaust temperature range; step S104, when the outlet exhaust temperature of the compressor is judged not to belong to the preset outlet exhaust temperature range, outlet temperature information of the indoor heat exchanger is obtained; and step S106, periodically adjusting the opening and closing degree of the expansion valve according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor belongs to a preset outlet exhaust temperature range.
Specifically, the cooling process of the air conditioner generally includes: the low-pressure steam enters the compressor, the compressor discharges high-pressure steam, the high-pressure steam flows into the indoor heat exchanger through the expansion valve, the indoor heat exchanger is equivalent to a condenser at the moment, the high-pressure steam evaporates in the indoor heat exchanger to absorb heat, and a fan of the indoor unit absorbs indoor air to exchange heat with the indoor heat exchanger so as to reduce the indoor temperature.
For example, when the preset outlet exhaust temperature range is 65-95 ℃, namely the preset outlet temperature is judged to be more than 95 ℃ or less than 55 ℃, the outlet temperature information of the indoor heat exchanger is obtained, so as to adjust the opening degree of the expansion valve, namely when the outlet exhaust temperature of the compressor is more than 95 ℃, the opening degree of the expansion valve is increased to reduce the pressure of the discharged high-pressure steam, further reducing the exhaust temperature, and when the outlet exhaust temperature of the compressor is less than 55 ℃, reducing the opening degree of the expansion valve, to increase the pressure of the discharged high-pressure steam and further increase the exhaust temperature, because the expansion valve is controlled by the indoor unit, therefore, the opening degree of the expansion valve is related to the outlet temperature information of the indoor heat exchanger, the corresponding average temperature correction value is determined according to the outlet temperature information, and adjusting the opening degree of the expansion valve according to the corresponding relation between the average temperature correction value and the opening degree.
The preset period for adjusting the opening degree of the expansion valve may be twice/120 seconds.
In the above technical solution, preferably, acquiring outlet temperature information of the indoor heat exchanger specifically includes: when the designated number is 1, detecting the real-time outlet temperature of 1 indoor heat exchanger according to a preset period; and determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period, wherein the preset period comprises at least one detection period, and the outlet temperature information comprises the real-time outlet temperature and the average temperature correction value.
In the technical scheme, when 1 indoor unit operates in a refrigeration mode, in order to overcome technical defects caused by the fixed opening and closing degree of an expansion valve, the real-time outlet temperature of 1 indoor heat exchanger is detected according to a preset period, an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period is determined, and the opening and closing degree of the expansion valve is adjusted at the end of each detection period according to the average temperature correction value.
In any one of the foregoing technical solutions, preferably, determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period specifically includes: the maximum value of the preset outlet exhaust temperature range is a first exhaust temperature, and when the outlet exhaust temperature of the compressor is detected to be higher than the first exhaust temperature, the average temperature correction value is determined according to a first preset average temperature calculation formula, wherein the first preset average temperature calculation formula comprises the following steps: te (Te)Average＝Tet-T1，TeAverageCharacterization of mean temperature correction value, TetCharacterizing the mean value, T, of the real-time outlet temperature over the detection period1And representing a first preset correction parameter, wherein the first preset correction parameter is larger than zero.
In the technical scheme, the maximum value of the preset outlet exhaust temperature range is a first exhaust temperature, when the outlet exhaust temperature of the compressor is detected to be higher than the first exhaust temperature, the average temperature correction value is determined according to a first preset average temperature calculation formula, and the formula Te is used for determining the average temperature correction valueAverage＝Tet-T1The average temperature correction value when the outlet exhaust temperature of the compressor is higher than the first exhaust temperature is intuitively and accurately calculated, the average value of the real-time outlet temperature in the detection period and the first preset correction parameter are taken into consideration, the accuracy of the average temperature correction value is further improved, the adjustment accuracy of the expansion valve is further improved, and the opening and closing degree of the expansion valve is periodically controlled to be increased when the outlet exhaust temperature is higher than the first exhaust temperature.
It is worth pointing out that, by controlling the outlet exhaust temperature of the compressor not to be too high, the volume rate reduction and the power consumption increase of the compressor can be avoided, and especially the carbon deposit and the acid by-products generated by the refrigerant are reduced, therefore, the type of the refrigerant determines the value of the first exhaust temperature.
In any of the above technical solutions, preferably, the real-time outlet temperature of the indoor heat exchanger is determined in each detection periodThe corresponding average temperature correction value specifically includes: the minimum value of the preset outlet exhaust temperature range is a second exhaust temperature, and when the outlet exhaust temperature of the compressor is detected to be lower than the second exhaust temperature, the average temperature correction value is determined according to a second preset average temperature calculation formula, wherein the second preset average temperature calculation formula comprises the following steps: te (Te)Average＝Tet+T2，TeAverageCharacterization of mean temperature correction value, TetCharacterizing the mean value, T, of the real-time outlet temperature over the detection period2And representing a second preset correction parameter, wherein the second preset correction parameter is larger than zero.
In the technical scheme, the minimum value of the preset outlet exhaust temperature range is the second exhaust temperature, when the outlet exhaust temperature of the compressor is detected to be lower than the second exhaust temperature, the average temperature correction value is determined according to a second preset average temperature calculation formula, and the formula Te is usedAverage＝Tet+T2And accurately calculating an average temperature correction value when the outlet exhaust temperature of the compressor is lower than the second exhaust temperature, namely periodically controlling the opening and closing degree of the expansion valve to be reduced when the outlet exhaust temperature is lower than the second exhaust temperature, particularly reducing the moisture vapor sucked by the compressor, and further improving the reliability of the compressor.
In any one of the foregoing technical solutions, preferably, the determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period further includes: and when the designated number is more than or equal to 1, calculating the average value of the real-time outlet temperatures of all the indoor heat exchangers in each detection period, and recording the average value as an average temperature correction value.
In the technical scheme, when the specified number is greater than or equal to 1, in each detection period, an average value of real-time outlet temperatures of all indoor heat exchangers (in an operating state) is calculated and recorded as an average temperature correction value, and similarly, the opening and closing degree of the expansion valve is determined according to the average temperature correction value.
Specifically, the determination process of the average temperature correction value is written as an auxiliary correction, and the specific correction process is as follows:
(1) if the indoor unit discharge temperature is too high, i.e., a (a ═ 95 ℃) is higher than or equal to a, the auxiliary correction is entered, and if B (B ═ 75 ℃) is lower than or equal to B, the auxiliary correction is exited.
(2) The auxiliary correction is entered when the indoor unit discharge air temperature is too low, that is, the discharge air is equal to or less than C (55℃), and exits when the discharge air temperature is equal to or more than D (65℃).
In any one of the above technical solutions, preferably, the periodically adjusting the opening and closing degree of the expansion valve according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor falls within a preset outlet exhaust temperature range specifically includes: determining a preset opening degree corresponding to the average temperature correction value; at the end of each detection period, adjusting the opening degree of the expansion valve to a preset opening degree; and when the outlet exhaust temperature of the compressor is detected to belong to the preset outlet exhaust temperature range, ending the detection period, wherein the average temperature correction value is positively correlated with the preset opening and closing degree.
According to the technical scheme, the opening degree of the expansion valve is adjusted to the preset opening degree by determining the preset opening degree corresponding to the average temperature correction value at the end time of each detection period, and the detection period is ended when the outlet exhaust temperature of the compressor is detected to belong to the preset outlet exhaust temperature range, so that the accuracy of adjusting the opening degree of the expansion valve is improved, the phenomenon of hydraulic compression caused by overheating operation or insufficient overheating of the compressor is reduced, the service life of the compressor is prolonged, and the reliability of the multi-connected air conditioner is improved.
The preset opening degree is set according to different refrigeration equipment, and the average temperature correction value is in positive correlation with the preset opening degree, namely the higher the average temperature correction value is, the larger the preset opening degree is.
Fig. 2 shows a schematic block diagram of an opening and closing degree control apparatus according to an embodiment of the present invention.
Fig. 2 shows an opening/closing degree control apparatus 200 according to an embodiment of the present invention, including: a judging unit 202, configured to judge whether an outlet exhaust temperature of the compressor belongs to a preset outlet exhaust temperature range when it is detected that a specified number of indoor units operate in a cooling mode; the obtaining unit 204 is configured to obtain outlet temperature information of the indoor heat exchanger when it is determined that the outlet exhaust temperature of the compressor does not belong to the preset outlet exhaust temperature range; and an adjusting unit 206, configured to periodically adjust an opening/closing degree of the expansion valve according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor falls within a preset outlet exhaust temperature range.
According to the technical scheme, when the specified number of indoor units are detected to operate in the refrigeration mode, whether the outlet exhaust temperature of the compressor belongs to the preset outlet exhaust temperature range is judged, when the outlet exhaust temperature of the compressor is judged not to belong to the preset outlet exhaust temperature range, outlet temperature information of the indoor heat exchanger is obtained, the opening degree of the expansion valve is periodically adjusted according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor belongs to the preset outlet exhaust temperature range, the opening degree of the expansion valve when the specified number of indoor units operate in the refrigeration mode is effectively adjusted, the outlet exhaust temperature of the compressor is controlled, the phenomenon of hydraulic compression caused by overheat operation or insufficient overheat of the compressor is reduced, the service life of the compressor is prolonged, and the reliability of the multi-connected air conditioner is improved.
Specifically, the cooling process of the air conditioner generally includes: the low-pressure steam enters the compressor, the compressor discharges high-pressure steam, the high-pressure steam flows into the indoor heat exchanger through the expansion valve, the indoor heat exchanger is equivalent to a condenser at the moment, the high-pressure steam evaporates in the indoor heat exchanger to absorb heat, and a fan of the indoor unit absorbs indoor air to exchange heat with the indoor heat exchanger so as to reduce the indoor temperature.
For example, when the preset outlet exhaust temperature range is 65-95 ℃, namely the preset outlet temperature is judged to be more than 95 ℃ or less than 55 ℃, the outlet temperature information of the indoor heat exchanger is obtained, so as to adjust the opening degree of the expansion valve, namely when the outlet exhaust temperature of the compressor is more than 95 ℃, the opening degree of the expansion valve is increased to reduce the pressure of the discharged high-pressure steam, further reducing the exhaust temperature, and when the outlet exhaust temperature of the compressor is less than 55 ℃, reducing the opening degree of the expansion valve, to increase the pressure of the discharged high-pressure steam and further increase the exhaust temperature, because the expansion valve is controlled by the indoor unit, therefore, the opening degree of the expansion valve is related to the outlet temperature information of the indoor heat exchanger, the corresponding average temperature correction value is determined according to the outlet temperature information, and adjusting the opening degree of the expansion valve according to the corresponding relation between the average temperature correction value and the opening degree.
The preset period for adjusting the opening degree of the expansion valve may be twice/120 seconds.
In any one of the above technical solutions, preferably, the opening/closing degree control device 200 further includes: the first detection unit 208 is configured to detect real-time outlet temperatures of 1 indoor heat exchangers according to a preset period when the designated number is 1; the first determining unit 210 is configured to determine an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period, where the preset period includes at least one detection period, and the outlet temperature information includes the real-time outlet temperature and the average temperature correction value.
In the technical scheme, when 1 indoor unit operates in a refrigeration mode, in order to overcome technical defects caused by the fixed opening and closing degree of an expansion valve, the real-time outlet temperature of 1 indoor heat exchanger is detected according to a preset period, an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period is determined, and the opening and closing degree of the expansion valve is adjusted at the end of each detection period according to the average temperature correction value.
In any one of the above technical solutions, preferably, the opening/closing degree control device 200 further includes: a first calculating unit 212, which presets the maximum value of the outlet discharge temperature range as a first discharge temperature, and is configured to determine an average temperature correction value according to a first preset average temperature calculation formula when detecting that the outlet discharge temperature of the compressor is greater than the first discharge temperature, where the first preset average temperature calculation formula includes: te (Te)Average＝Tet-T1，TeAverageCharacterization of mean temperature correction value, TetCharacterizing the mean value, T, of the real-time outlet temperature over the detection period1And representing a first preset correction parameter, wherein the first preset correction parameter is larger than zero.
In the technical scheme, the maximum value of the preset outlet exhaust temperature range is a first exhaust temperature, when the outlet exhaust temperature of the compressor is detected to be higher than the first exhaust temperature, the average temperature correction value is determined according to a first preset average temperature calculation formula, and the formula Te is used for determining the average temperature correction valueAverage＝Tet-T1The average temperature correction value when the outlet exhaust temperature of the compressor is higher than the first exhaust temperature is intuitively and accurately calculated, the average value of the real-time outlet temperature in the detection period and the first preset correction parameter are taken into consideration, the accuracy of the average temperature correction value is further improved, the adjustment accuracy of the expansion valve is further improved, and the opening and closing degree of the expansion valve is periodically controlled to be increased when the outlet exhaust temperature is higher than the first exhaust temperature.
It is worth pointing out that, by controlling the outlet exhaust temperature of the compressor not to be too high, the volume rate reduction and the power consumption increase of the compressor can be avoided, and especially the carbon deposit and the acid by-products generated by the refrigerant are reduced, therefore, the type of the refrigerant determines the value of the first exhaust temperature.
In any one of the above technical solutions, preferably, the opening/closing degree control device 200 further includes: a second calculating unit 214, configured to preset a minimum value of the outlet discharge temperature range as a second discharge temperature, and configured to determine, when it is detected that the outlet discharge temperature of the compressor is less than the second discharge temperature, an average temperature correction value according to a second preset average temperature calculation formula, where the second preset average temperature calculation formula includes: te (Te)Average＝Tet+T2，TeAverageCharacterization of mean temperature correction value, TetCharacterizing the mean value, T, of the real-time outlet temperature over the detection period2And representing a second preset correction parameter, wherein the second preset correction parameter is larger than zero.
In the technical scheme, the minimum value of the range of the preset outlet exhaust temperature is the second exhaust temperature, and the detection is carried outWhen the outlet exhaust temperature of the compressor is lower than the second exhaust temperature, determining the average temperature correction value according to a second preset average temperature calculation formula, and determining the average temperature correction value according to a formula TeAverage＝Tet+T2And accurately calculating an average temperature correction value when the outlet exhaust temperature of the compressor is lower than the second exhaust temperature, namely periodically controlling the opening and closing degree of the expansion valve to be reduced when the outlet exhaust temperature is lower than the second exhaust temperature, particularly reducing the moisture vapor sucked by the compressor, and further improving the reliability of the compressor.
In any one of the above technical solutions, preferably, the opening/closing degree control device 200 further includes: and the third calculating unit 216 is used for calculating the average value of the real-time outlet temperatures of all the indoor heat exchangers in each detection period and recording the average value as an average temperature correction value when the designated number is greater than or equal to 1.
In the technical scheme, when the specified number is greater than or equal to 1, in each detection period, an average value of real-time outlet temperatures of all indoor heat exchangers (in an operating state) is calculated and recorded as an average temperature correction value, and similarly, the opening and closing degree of the expansion valve is determined according to the average temperature correction value.
Specifically, the determination process of the average temperature correction value is written as an auxiliary correction, and the specific correction process is as follows:
(1) if the indoor unit discharge temperature is too high, i.e., a (a ═ 95 ℃) is higher than or equal to a, the auxiliary correction is entered, and if B (B ═ 75 ℃) is lower than or equal to B, the auxiliary correction is exited.
(2) The auxiliary correction is entered when the indoor unit discharge air temperature is too low, that is, the discharge air is equal to or less than C (55℃), and exits when the discharge air temperature is equal to or more than D (65℃).
In any one of the above technical solutions, preferably, the opening/closing degree control device 200 includes: a second determining unit 218, configured to determine a preset opening degree corresponding to the average temperature correction value; the adjusting unit 206 is further configured to: at the end of each detection period, adjusting the opening degree of the expansion valve to a preset opening degree; the adjusting unit 206 is further configured to: and when the outlet exhaust temperature of the compressor is detected to belong to the preset outlet exhaust temperature range, ending the detection period, wherein the average temperature correction value is positively correlated with the preset opening and closing degree.
According to the technical scheme, the opening degree of the expansion valve is adjusted to the preset opening degree by determining the preset opening degree corresponding to the average temperature correction value at the end time of each detection period, and the detection period is ended when the outlet exhaust temperature of the compressor is detected to belong to the preset outlet exhaust temperature range, so that the accuracy of adjusting the opening degree of the expansion valve is improved, the phenomenon of hydraulic compression caused by overheating operation or insufficient overheating of the compressor is reduced, the service life of the compressor is prolonged, and the reliability of the multi-connected air conditioner is improved.
The preset opening degree is set according to different refrigeration equipment, and the average temperature correction value is in positive correlation with the preset opening degree, namely the higher the average temperature correction value is, the larger the preset opening degree is.
Fig. 3 shows a schematic block diagram of a multi-connected air conditioner according to an embodiment of the present invention.
As shown in fig. 3, which illustrates a multi-type air conditioner 300 according to an embodiment of the present invention, the multi-type air conditioner 300 includes at least one indoor unit 300A and a compressor 300B.
In this technical solution, a plurality of indoor units 300A (1), 300A (2) … … 300A (n-1), 300A (n), respectively) of the multi-connected air conditioner 300 are connected in parallel to one compressor 300B, where n is greater than or equal to 1, and an expansion valve is disposed in a communication pipe between an indoor heat exchanger of each indoor unit 300A and the compressor 300B.
Example 2:
fig. 4 shows a schematic flow chart of a method of controlling a degree of opening and closing according to another embodiment of the present invention.
Fig. 4 is a schematic flow chart of a method for controlling a degree of opening and closing according to another embodiment of the present invention, including: step S402, in the detectionWhen one indoor unit operates in a refrigeration mode, acquiring the outlet exhaust temperature of the compressor according to a preset period; step S404, determining whether the outlet exhaust temperature belongs to a preset outlet exhaust temperature range, if yes, performing step S402, if no 1 (first negative condition), performing step S406, if no 2 (second negative condition), performing step S408; step S406, when the outlet exhaust temperature of the compressor is higher than the first exhaust temperature, according to TeAverageCalculating an average temperature correction value Te (Tet-T1)Average(ii) a Step S408, when the outlet exhaust temperature of the compressor is lower than the second exhaust temperature, according to TeAverageCalculating an average temperature correction value Te (Tet + T2)Average(ii) a Step S410, correcting value Te according to average temperatureAverageThe opening degree of the expansion valve is determined.
Example 3:
fig. 5 shows a schematic flow chart of a method of controlling a degree of opening and closing according to another embodiment of the present invention.
Fig. 5 is a schematic flow chart of a method for controlling a degree of opening and closing according to another embodiment of the present invention, including: step S502, collecting the outlet exhaust temperature of the compressor according to a preset period when a plurality of indoor units are detected to run in a refrigeration mode; step S504, judging whether the outlet exhaust temperature belongs to a preset outlet exhaust temperature range, if so, executing step S502, and if not, executing step S506; step S506, calculating the average value of the real-time outlet temperatures of all the indoor heat exchangers according to the preset period, and recording the average temperature correction value TeAverage(ii) a Step S508, correcting value Te according to average temperatureAverageThe opening degree of the expansion valve is determined.
According to the opening and closing degree control scheme of the present invention, there is also provided a computer-readable storage medium having a computer program stored thereon, the computer program being executed by a processor for: when detecting that a specified number of indoor units operate in a refrigeration mode, judging whether the outlet exhaust temperature of the compressor belongs to a preset outlet exhaust temperature range; when the outlet exhaust temperature of the compressor is judged not to belong to the preset outlet exhaust temperature range, outlet temperature information of the indoor heat exchanger is obtained; and indirectly adjusting the opening and closing degree of the expansion valve periodically according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor belongs to a preset outlet exhaust temperature range.
According to the technical scheme, when the specified number of indoor units are detected to operate in the refrigeration mode, whether the outlet exhaust temperature of the compressor belongs to the preset outlet exhaust temperature range is judged, when the outlet exhaust temperature of the compressor is judged not to belong to the preset outlet exhaust temperature range, outlet temperature information of the indoor heat exchanger is obtained, the opening and closing degree of the expansion valve is periodically adjusted according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor belongs to the preset outlet exhaust temperature range, the outlet exhaust temperature of the compressor is effectively controlled, the phenomenon that the compressor is overheated or the overheating degree is insufficient to cause hydraulic compression is reduced, the service life of the compressor is prolonged, and the reliability of the multi-connected air conditioner is improved.
Specifically, the cooling process of the air conditioner generally includes: the low-pressure steam enters the compressor, the compressor discharges high-pressure steam, the high-pressure steam flows into the indoor heat exchanger through the expansion valve, the indoor heat exchanger is equivalent to a condenser at the moment, the high-pressure steam evaporates in the indoor heat exchanger to absorb heat, and a fan of the indoor unit absorbs indoor air to exchange heat with the indoor heat exchanger so as to reduce the indoor temperature.
For example, when the preset outlet exhaust temperature range is 65-95 ℃, namely the preset outlet temperature is judged to be more than 95 ℃ or less than 55 ℃, the outlet temperature information of the indoor heat exchanger is obtained, so as to adjust the opening degree of the expansion valve, namely when the outlet exhaust temperature of the compressor is more than 95 ℃, the opening degree of the expansion valve is increased to reduce the pressure of the discharged high-pressure steam, further reducing the exhaust temperature, and when the outlet exhaust temperature of the compressor is less than 55 ℃, reducing the opening degree of the expansion valve, to increase the pressure of the discharged high-pressure steam and further increase the exhaust temperature, because the expansion valve is controlled by the indoor unit, therefore, the opening degree of the expansion valve is related to the outlet temperature information of the indoor heat exchanger, the corresponding average temperature correction value is determined according to the outlet temperature information, and adjusting the opening degree of the expansion valve according to the corresponding relation between the average temperature correction value and the opening degree.
The preset period for adjusting the opening degree of the expansion valve may be twice/120 seconds.
In the above technical solution, preferably, acquiring outlet temperature information of the indoor heat exchanger specifically includes: when the designated number is 1, detecting the real-time outlet temperature of 1 indoor heat exchanger according to a preset period; and determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period, wherein the preset period comprises at least one detection period, and the outlet temperature information comprises the real-time outlet temperature and the average temperature correction value.
In the technical scheme, when 1 indoor unit operates in a refrigeration mode, in order to overcome technical defects caused by the fixed opening and closing degree of an expansion valve, the real-time outlet temperature of 1 indoor heat exchanger is detected according to a preset period, an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period is determined, and the opening and closing degree of the expansion valve is adjusted at the end of each detection period according to the average temperature correction value.
In any one of the foregoing technical solutions, preferably, determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period specifically includes: the maximum value of the preset outlet exhaust temperature range is a first exhaust temperature, and when the outlet exhaust temperature of the compressor is detected to be higher than the first exhaust temperature, the average temperature correction value is determined according to a first preset average temperature calculation formula, wherein the first preset average temperature calculation formula comprises the following steps: te (Te)Average＝Tet-T1，TeAverageCharacterization of mean temperature correction value, TetCharacterizing the mean value, T, of the real-time outlet temperature over the detection period1And representing a first preset correction parameter, wherein the first preset correction parameter is larger than zero.
In the technical scheme, the maximum value of the preset outlet exhaust temperature range is a first exhaust temperature, when the outlet exhaust temperature of the compressor is detected to be higher than the first exhaust temperature, the average temperature correction value is determined according to a first preset average temperature calculation formula, and the formula Te is used for determining the average temperature correction valueAverage＝Tet-T1The average temperature correction value when the outlet exhaust temperature of the compressor is higher than the first exhaust temperature is intuitively and accurately calculated, the average value of the real-time outlet temperature in the detection period and the first preset correction parameter are taken into consideration, the accuracy of the average temperature correction value is further improved, the adjustment accuracy of the expansion valve is further improved, and the opening and closing degree of the expansion valve is periodically controlled to be increased when the outlet exhaust temperature is higher than the first exhaust temperature.
It is worth pointing out that, by controlling the outlet exhaust temperature of the compressor not to be too high, the volume rate reduction and the power consumption increase of the compressor can be avoided, and especially the carbon deposit and the acid by-products generated by the refrigerant are reduced, therefore, the type of the refrigerant determines the value of the first exhaust temperature.
In any one of the foregoing technical solutions, preferably, the determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period further includes: the minimum value of the preset outlet exhaust temperature range is a second exhaust temperature, and when the outlet exhaust temperature of the compressor is detected to be lower than the second exhaust temperature, the average temperature correction value is determined according to a second preset average temperature calculation formula, wherein the second preset average temperature calculation formula comprises the following steps: te (Te)Average＝Tet+T2，TeAverageCharacterization of mean temperature correction value, TetCharacterizing the mean value, T, of the real-time outlet temperature over the detection period2And representing a second preset correction parameter, wherein the second preset correction parameter is larger than zero.
In the technical scheme, the minimum value of the preset outlet exhaust temperature range is the second exhaust temperature, when the outlet exhaust temperature of the compressor is detected to be lower than the second exhaust temperature, the average temperature correction value is determined according to a second preset average temperature calculation formula, and the formula Te is usedAverage＝Tet+T2Accurately calculating the average temperature correction value when the outlet exhaust temperature of the compressor is lower than the second exhaust temperature, namely periodically controlling the opening and closing degree of the expansion valve to be reduced when the outlet exhaust temperature is lower than the second exhaust temperature, particularly reducing the moisture vapor sucked by the compressor, thereby improving the reliability of the compressorAnd (4) sex.
In any one of the foregoing technical solutions, preferably, the determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period further includes: and when the designated number is more than or equal to 1, calculating the average value of the real-time outlet temperatures of all the indoor heat exchangers in each detection period, and recording the average value as an average temperature correction value.
In the technical scheme, when the specified number is greater than or equal to 1, in each detection period, an average value of real-time outlet temperatures of all indoor heat exchangers (in an operating state) is calculated and recorded as an average temperature correction value, and similarly, the opening and closing degree of the expansion valve is determined according to the average temperature correction value.
Specifically, the determination process of the average temperature correction value is written as an auxiliary correction, and the specific correction process is as follows:
(1) if the indoor unit discharge temperature is too high, i.e., a (a ═ 95 ℃) is higher than or equal to a, the auxiliary correction is entered, and if B (B ═ 75 ℃) is lower than or equal to B, the auxiliary correction is exited.
(2) The auxiliary correction is entered when the indoor unit discharge air temperature is too low, that is, the discharge air is equal to or less than C (55℃), and exits when the discharge air temperature is equal to or more than D (65℃).
In any one of the above technical solutions, preferably, the periodically adjusting the opening and closing degree of the expansion valve according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor falls within a preset outlet exhaust temperature range specifically includes: determining a preset opening degree corresponding to the average temperature correction value; at the end of each detection period, adjusting the opening degree of the expansion valve to a preset opening degree; and when the outlet exhaust temperature of the compressor is detected to belong to the preset outlet exhaust temperature range, ending the detection period, wherein the average temperature correction value is positively correlated with the preset opening and closing degree.
According to the technical scheme, the opening degree of the expansion valve is adjusted to the preset opening degree by determining the preset opening degree corresponding to the average temperature correction value at the end time of each detection period, and the detection period is ended when the outlet exhaust temperature of the compressor is detected to belong to the preset outlet exhaust temperature range, so that the accuracy of adjusting the opening degree of the expansion valve is improved, the phenomenon of hydraulic compression caused by overheating operation or insufficient overheating of the compressor is reduced, the service life of the compressor is prolonged, and the reliability of the multi-connected air conditioner is improved.
The preset opening degree is set according to different refrigeration equipment, and the average temperature correction value is in positive correlation with the preset opening degree, namely the higher the average temperature correction value is, the larger the preset opening degree is.
The technical scheme of the invention is explained in detail in the above with the accompanying drawings, the invention provides an opening and closing degree control method, an opening and closing degree control device and refrigeration equipment, when the indoor units with the designated number are detected to run in the cooling mode, whether the outlet exhaust temperature of the compressor belongs to the preset outlet exhaust temperature range is judged, when the outlet exhaust temperature of the compressor is judged not to belong to the preset outlet exhaust temperature range, the outlet temperature information of the indoor heat exchanger is obtained, the opening and closing degree of the expansion valve is periodically adjusted according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor belongs to the preset outlet exhaust temperature range, so that the outlet exhaust temperature of the compressor is effectively controlled, the phenomenon of hydraulic compression caused by overheat operation or insufficient overheat degree of the compressor is reduced, the service life of the compressor is prolonged, and the reliability of the multi-connected air conditioner is improved.
The steps in the method of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the device of the invention can be merged, divided and deleted according to actual needs.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The opening and closing degree control method is suitable for an expansion valve of refrigeration equipment, the refrigeration equipment further comprises at least one indoor unit and a compressor, the expansion valve is arranged in a communication pipeline between an indoor heat exchanger of each indoor unit and the compressor, and the opening and closing degree control method is characterized by comprising the following steps:
when detecting that the specified number of indoor units operate in a refrigeration mode, judging whether the outlet exhaust temperature of the compressor belongs to a preset outlet exhaust temperature range;
when the outlet exhaust temperature of the compressor is judged not to belong to the preset outlet exhaust temperature range, outlet temperature information of the indoor heat exchanger is obtained;
the acquiring of the outlet temperature information of the indoor heat exchanger specifically includes:
when the designated number is 1, detecting the real-time outlet temperature of 1 indoor heat exchanger according to a preset period; determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period, wherein the preset period comprises at least one detection period, and the outlet temperature information comprises the real-time outlet temperature and the average temperature correction value;
determining an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period, specifically comprising:
the maximum value of the preset outlet exhaust temperature range is a first exhaust temperature, and when the outlet exhaust temperature of the compressor is detected to be higher than the first exhaust temperature, the average temperature correction value is determined according to a first preset average temperature calculation formula, wherein the first preset average temperature calculation formula comprises:
Teaverage＝Tet-T1，
Said TeAverageCharacterizing said mean temperature correction value, TetCharacterizing the real-time outputAverage value of the mouth temperature in the detection period, T1Representing a first preset correction parameter, wherein the first preset correction parameter is larger than zero;
and periodically adjusting the opening and closing degree of the expansion valve according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor belongs to the preset outlet exhaust temperature range.
2. The opening and closing degree control method according to claim 1, wherein the average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period is determined, and the method specifically comprises the following steps:
the minimum value of the preset outlet exhaust temperature range is a second exhaust temperature, when the outlet exhaust temperature of the compressor is detected to be lower than the second exhaust temperature, the average temperature correction value is determined according to a second preset average temperature calculation formula,
wherein the second preset average temperature calculation formula includes:
Teaverage＝Tet+T2，
Said TeAverageCharacterizing said mean temperature correction value, TetCharacterizing an average value of the real-time outlet temperature over the detection period, the T2And representing a second preset correction parameter, wherein the second preset correction parameter is larger than zero.
3. The opening and closing degree control method according to claim 1, wherein the average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period is determined, and the method specifically comprises the following steps:
and when the specified number is more than or equal to 1, calculating the average value of the real-time outlet temperatures of all the indoor heat exchangers in each detection period, and recording the average value as the average temperature correction value.
4. The opening and closing degree control method according to any one of claims 1 to 3, wherein the opening and closing degree of the expansion valve is periodically adjusted according to the outlet temperature information of the indoor heat exchanger until the outlet discharge temperature of the compressor falls within the preset outlet discharge temperature range, specifically comprising:
determining a preset opening degree corresponding to the average temperature correction value;
adjusting the opening degree of the expansion valve to the preset opening degree at the end time of each detection period;
ending the detection period when the outlet exhaust temperature of the compressor is detected to belong to the preset outlet exhaust temperature range,
wherein the average temperature correction value is positively correlated with the preset opening and closing degree.
5. The utility model provides an opening degree controlling means, is applicable to refrigeration plant's expansion valve, refrigeration plant still includes at least one indoor set and a compressor, every the indoor heat exchanger of indoor set with be equipped with in the intercommunication pipeline between the compressor the expansion valve which characterized in that, opening degree controlling means includes:
the judging unit is used for judging whether the outlet exhaust temperature of the compressor belongs to a preset outlet exhaust temperature range or not when detecting that the specified number of indoor units operate in the refrigeration mode;
the obtaining unit is used for obtaining outlet temperature information of the indoor heat exchanger when the outlet exhaust temperature of the compressor is judged not to belong to the preset outlet exhaust temperature range;
the first detection unit is used for detecting the real-time outlet temperature of 1 indoor heat exchanger according to a preset period when the designated number is 1;
a first determining unit, configured to determine an average temperature correction value corresponding to the real-time outlet temperature of the indoor heat exchanger in each detection period,
the preset period comprises at least one detection period, and the outlet temperature information comprises the real-time outlet temperature and the average temperature correction value;
a first calculation unit, the maximum value of the preset outlet exhaust temperature range being a first exhaust temperature, for determining the average temperature correction value according to a first preset average temperature calculation formula when it is detected that the outlet exhaust temperature of the compressor is greater than the first exhaust temperature,
wherein the first preset average temperature calculation formula comprises:
Teaverage＝Tet-T1，
Said TeAverageCharacterizing said mean temperature correction value, TetCharacterizing an average value of the real-time outlet temperature over the detection period, the T1Representing a first preset correction parameter, wherein the first preset correction parameter is larger than zero;
and the adjusting unit is used for periodically adjusting the opening and closing degree of the expansion valve according to the outlet temperature information of the indoor heat exchanger until the outlet exhaust temperature of the compressor belongs to the preset outlet exhaust temperature range.
6. The opening-closing degree control device according to claim 5, further comprising:
a second calculation unit, wherein the minimum value of the preset outlet exhaust temperature range is a second exhaust temperature, and the second calculation unit is used for determining the average temperature correction value according to a second preset average temperature calculation formula when the outlet exhaust temperature of the compressor is detected to be lower than the second exhaust temperature,
wherein the second preset average temperature calculation formula includes:
Teaverage＝Tet+T2，
Said TeAverageCharacterizing said mean temperature correction value, TetCharacterizing an average value of the real-time outlet temperature over the detection period, the T2And representing a second preset correction parameter, wherein the second preset correction parameter is larger than zero.
7. The opening-closing degree control device according to claim 5, further comprising:
and the third calculating unit is used for calculating the average value of the real-time outlet temperatures of all the indoor heat exchangers in each detection period and recording the average value as the average temperature correction value when the specified number is greater than or equal to 1.
8. The opening-closing degree control device according to any one of claims 5 to 7, comprising:
the second determining unit is used for determining the preset opening degree corresponding to the average temperature correction value;
the adjustment unit is further configured to: adjusting the opening degree of the expansion valve to the preset opening degree at the end time of each detection period;
the adjustment unit is further configured to: ending the detection period when the outlet exhaust temperature of the compressor is detected to belong to the preset outlet exhaust temperature range,
wherein the average temperature correction value is positively correlated with the preset opening and closing degree.
9. A refrigeration apparatus, comprising:
the opening-closing degree control device according to any one of claims 5 to 8.
10. The refrigeration apparatus as claimed in claim 9, wherein the refrigeration apparatus is a multi-type air conditioner in which a plurality of indoor units are connected in parallel to one compressor.
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